Unfortunately, this is the second tank I've received due to issues. The first (white one) had issues with the fuel pump mounting area:

The inside edge was trimmed very close to the threaded insert plus it had that bad mold area that I was concerned would cause problems with the fuel pump mounting flange gasket. I spoke with the vendor and they shipped out another tank PDQ (red was the option).

The white one does not have any of this porosity issue, and the red tank only has it on the bottom. Here's a shot of the top:

I hate to keep going on and on with this but for a $700 tank, I'd expect some QC.... I'll call the vendor tomorrow and see what the lead time is on a new batch of tanks.

BTW, I wasn't sure if Clark, IMS, Acerbis or other tanks might have had this issue occasionaly?